关键词: 页岩, 可压性评价, 岩石力学, 体积压裂, 地质力学

Abstract: Through analyzing the fracture of gas shale in America, the fractured gas wells with highproductivity are these with good fracability, not the ones with complex fracturing process or high breakdown pressure. Using the useful fracturing experience of the typical shale gas reservoir in Amecica for reference, this paper tried to explore the fracability evaluation system of gas shale in China from three orientationsgeological evaluation index, volume fracture evaluation index for gas shale, engineering technology evaluation index. Through evaluating the geological characteristics of shale gas reservoir, the geological indexs like the total geological reserves, the geological “sweet spot”, and the maturity can be comfirmed; the volumn fracture indexs like the rock brittleness parameters of the reservoir, the natural fractures, the dig angle, the crustal stress can be get to evaluate the feasibility of volumn fracture; the engineering indexs like the way of fracturing stimulation, the casing perforation type, the behavior of fracturing fluid can be optimized. This paper optimizes the dominant factors that can affect the reservoir’s fracability and chooses the indexs that can reflect the geological mechanical fracability most directly to establish one key index system of fracability evaluation of gas shale reservoir on the base of the domestic complex geological condition and engineering condition. The index system can provide reference index for establishing the model of gas shale fracability and forming the hazardcontrol methods.

Key words: Gas shale,    ,  Fracability evaluation,    , Rock machanics,    ,  Volumn fracture,    ,  Geological machanics